I took the index in the words, transformed the quantity to binary, additional three zeros, calculated the sha256 digest, took the very first A part of the hexadecimal to transform it to binary, added three zeros to the 8 digits with the binary and bought 00000010011 which interprets to 19 https://agendabookmarks.com/story18756440/not-known-factual-statements-about-bip39-explained